设计模式之抽象工厂模式

我们定义了抽象产品A和B以及它们的具体实现类。然后，我们定义了抽象工厂和具体工厂1和2，每个具体工厂都实现了创建产品A和B的方法。在主函数中，我们使用具体工厂1和2创建了产品A和B。

跟简单工厂模式不一样的是，工厂也变成了多个工厂，即举个例子，肯德基和麦当劳都可以做不一样的炸鸡汉堡。

实现

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#include <iostream>

// 抽象产品A
class AbstractProductA {
public:
    virtual void operationA() = 0;
};

// 具体产品A1
class ConcreteProductA1 : public AbstractProductA {
public:
    void operationA() override {
        std::cout << "ConcreteProductA1 operationA" << std::endl;
    }
};

// 具体产品A2
class ConcreteProductA2 : public AbstractProductA {
public:
    void operationA() override {
        std::cout << "ConcreteProductA2 operationA" << std::endl;
    }
};

// 抽象产品B
class AbstractProductB {
public:
    virtual void operationB() = 0;
};

// 具体产品B1
class ConcreteProductB1 : public AbstractProductB {
public:
    void operationB() override {
        std::cout << "ConcreteProductB1 operationB" << std::endl;
    }
};

// 具体产品B2
class ConcreteProductB2 : public AbstractProductB {
public:
    void operationB() override {
        std::cout << "ConcreteProductB2 operationB" << std::endl;
    }
};

// 抽象工厂
class AbstractFactory {
public:
    virtual AbstractProductA* createProductA() = 0;
    virtual AbstractProductB* createProductB() = 0;
};

// 具体工厂1
class ConcreteFactory1 : public AbstractFactory {
public:
    AbstractProductA* createProductA() override {
        return new ConcreteProductA1();
    }

    AbstractProductB* createProductB() override {
        return new ConcreteProductB1();
    }
};

// 具体工厂2
class ConcreteFactory2 : public AbstractFactory {
public:
    AbstractProductA* createProductA() override {
        return new ConcreteProductA2();
    }

    AbstractProductB* createProductB() override {
        return new ConcreteProductB2();
    }
};

int main() {
    // 使用具体工厂1创建产品
    AbstractFactory* factory1 = new ConcreteFactory1();
    AbstractProductA* productA1 = factory1->createProductA();
    AbstractProductB* productB1 = factory1->createProductB();
    productA1->operationA();
    productB1->operationB();

    // 使用具体工厂2创建产品
    AbstractFactory* factory2 = new ConcreteFactory2();
    AbstractProductA* productA2 = factory2->createProductA();
    AbstractProductB* productB2 = factory2->createProductB();
    productA2->operationA();
    productB2->operationB();

    delete factory1;
    delete productA1;
    delete productB1;

    delete factory2;
    delete productA2;
    delete productB2;

    return 0;
}